このコンテンツは設定された言語で表示できません。

このコンテンツは表示可能な別の言語で表示されています。 お使いのブラウザに翻訳機能がある場合はご利用ください。

Why Does NI 9411 Read 1.5V Between COM and the Digital Inputs?

Updated Apr 24, 2023

Reported In

Hardware

  • NI-9411

Issue Details

When I measure the voltage between the common line and a digital input on my NI 9411 digital input module I see roughly 1.5V. Why is this?

Solution

The 9411 doesn't have internal pull-up or pull-down resistors that pull the digital lines high or low. This being the case, the values on the pins float around 1.5V.

This allows you to add whichever resistor scheme you wish to have implemented in your measurement setup. However, adding pull-up or pull-down resistors is not necessary if the external device which is driving the digital lines can drive the signal both high and low.

Related Links

Other Support Options

Ask the NI Community

Collaborate with other users in our discussion forums



Request Support from an Engineer

A valid service agreement or active software subscription may be required, and support options vary by country.